| 摘要 |
<p>The device of the invention comprises means for generating a radio-frequency signal, transmitting antenna means (33) fed by the radio-frequency signal to establish a radio-frequency field coupled electromagnetically to the fluid contained in the tank, receiving antenna means (34) to receive the signal emitted by the transmitting antenna (33) after said signal has passed through the fluid, and means for measuring the strength of the signal received by the receiving antenna (34) to provide a signal indicative of the properties of the transmissive medium lying between the transmitting antenna (33) and the receiving antenna (34). The transmitting antenna (33) and receiving antenna (34) are enclosed within a container (30, 31) which is constructed of low loss material unattackable by any fluids contained in the tank, and is arranged to prevent direct contact between the antennas (33, 34) and the fluid or fluids contained in the tank.</p> |
